chore: Remove use of global vars + other cleanups

lua/symbols-outline/parser.lua

@@ -217,7 +217,7 @@ function M.get_lines(flattened_outline_items)
     local hl_start = #string_prefix
     local hl_end = #string_prefix + #value.icon
     table.insert(lines, string_prefix .. value.icon .. ' ' .. value.name)
-    hl_type = config.options.symbols[symbols.kinds[value.kind]].hl
+    local hl_type = config.options.symbols[symbols.kinds[value.kind]].hl
     table.insert(hl_info, { hl_start, hl_end, hl_type })
   end
   return lines, hl_info

lua/symbols-outline/ui.lua

@@ -1,6 +1,4 @@
 local vim = vim
-local config = require 'symbols-outline.config'
-local symbol_kinds = require('symbols-outline.symbols').kinds
 local M = {}
 
 M.markers = {
@@ -55,8 +53,6 @@ function M.setup_highlights()
     )
   end
 
-  local symbols = config.options.symbols
-
   -- markers
   highlight_text('marker_middle', M.markers.middle, 'SymbolsOutlineConnector')
   highlight_text(

lua/symbols-outline/writer.lua

@@ -25,7 +25,7 @@ end
 
 function M.add_highlights(bufnr, hl_info)
   for line, line_hl in ipairs(hl_info) do
-    hl_start, hl_end, hl_type = unpack(line_hl)
+    local hl_start, hl_end, hl_type = unpack(line_hl)
     vim.api.nvim_buf_add_highlight(
       bufnr,
       hlns,